Walker Pres tn Patural —_ 
Y the provisions of the will of the late Dr. William accom! Walker two prizes are annually offered | 
Boston respi of Natural ce the best memoirs written in the English language, on subjess 
proposed by d by the Counci 
For the hen 5 memoir presented a hei pe - of sixty dollars may = awarded ; n however, pede memoir be one d 
eis magi the amount may be sed t the pons fe of the Com 
t the next ys t memoir a fty dollars pote be awa 
sy will not be awarded unless ite — gle fie are of adequate jose 
The ‘conipetition for these prizes ts not restricted, but ts open to all. 
a on is & especially called to the following eager 
n al to be based on a considerable body of original and unpublished work, accom 
sainied. by a general view of the literature of the abies, 
2, Anything in the eta which shall furnish proof of the identity of the author shall be considered as deber 
ring the essay from oa. io 
3. Preference will b irs showing intri id f being based upon researches made diresy 
in sige for the prizes. shed 
. Each memoir must be accompanie ed by a the author’s name and superscri 
0 one borne by the pa olny pit must be in < hands ul the Secretary on or before yd 
of tbe yer for which ‘the prize is offered, 
li y for publication of manuscripts submitted, 
“ SUBJECTS FOR 1906: 
1. An experimental field-study in ecolog 
2. - contribution to a know aay of thet nature of c ap 5 ay in plants. 
3- A physiological life hist of a single species of plan 
4. ithe aed ofa i of fossil organisms. 
5. A study in stratig raphy: 
6. A fesenrch in mineral physics 
z. A study of entectics in rock magm mas, 
Pp 
. A study in river capture. 
ebsipndm mrad FOR 1907: 
Th ie e fossil plant or sinh of fossil plants. 
Py developeocat oft the sie in any little kno 
be anatom some order or group of f the e angiosperms. i 
and habits of animals i in their relations to environment and to each other. 
° The habits neck structure $e an vty species of the Myriapo 
A contribution to a knowledge of the rate of speed at which birds travel. ‘ tay: 
Boston Soctety or NATURAL Histon, LLEN, Secre 
Boston, Mass., U.S.A GLOVER M. s 
f she Coniferales. 
atte 
= 
S 
Ss 
0 
¢, 
THE ZEISS EPIDIASCOPE 
f botl 
is the most successful lantern for the projection © 
0 
Opaque objects and lantern slides. Photographs, bo 
bri 
illustrations, leaves, flowers, dissections, etc. ee 
olo 
liantly shown on the screen in their natural he ; 
jolog 
The instrument should be in every well- equipped b : 
” yequer 
cal lecture room. Fadl particulars and prices on 
THE SCIENTIFIC SHOP 
ALBERT 8B. PORTER 
Scientific Instruments 326 Dearborn 
) 
Street, CHI ca! 
